Session 8: The Markowitz problem p. 1
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1 Session 8: The Markowitz problem Susan Thomas susant IGIDR Bombay Session 8: The Markowitz problem p. 1
2 Portfolio optimisation Session 8: The Markowitz problem p. 2
3 Definitions Asset: an instrument that can be easily traded Rate of return, r: Amount received Amount invested Amount invested To get closer to normality, r t = log(p t /P t 1 ) In a world with normal random variables, returns on one asset is the random variable such that: r N(µ r, σ 2 r) For a pair of normal random variables, (r 1, r 2 ): covariance σ r1 r 2, correlation coefficient ρ r1 r 2. Session 8: The Markowitz problem p. 3
4 Defining a two-asset portfolio We have two assets, A, B, which have returns defined as r A N(µ A, σ 2 A ), r B N(µ B, σ 2 B ). They have a covariance of σ AB and a correlation coefficient ρ AB. The portfolio is defined as a set of weights, which is the fraction invested in each asset: w A, w B (w B = 1 w A ) With this information, we can calculate: r p σ 2 p = w A r A + w B r B = w 2 Aσ 2 A + w 2 Bσ 2 B + 2w A w B σ AB Session 8: The Markowitz problem p. 4
5 Matrix notation We can re-write the portfolio definition as follows: Portfolio = w = (w A, w B ) Asset returns = r = (r A, r B ) Asset variance-covariance matrix = Σ [ ] σ 2 A σ AB σ AB σ 2 B Session 8: The Markowitz problem p. 5
6 Re-expressing portfolio returns and variance Portfolio returns, r p w r = [w A w B ] [ ra r B = w A r A + w B r B ] Portfolio variance, σ 2 p w Σ w = [w A w B ] [ σ 2 A σ AB σ AB σ 2 B ] [ wa w B ] = w 2 Aσ 2 A + 2w A w B σ AB + w 2 Bσ 2 B Session 8: The Markowitz problem p. 6
7 Generalising to an n-asset portfolio n-asset portfolio: w = (w 1, w 2, w 3,..., w n ) There are n assets, each of which are normally distributed as N(µ i, σ 2 i ). Each asset i has a covariance with another asset j of σ ij. Therefore, the assets are multivariate normally (MVN) distributed as: µ 1 σ 2 1 σ σ 1n N µ 2..., σ 21 σ σ 2n µ n σ n1 σ n2... σn 2 Session 8: The Markowitz problem p. 7
8 Returns and variance of an n-asset portfolio r p = w µ = (w 1, w 2,..., w n ) µ 1 µ 2... µ n σ 2 p = w Σ w = (w 1, w 2,..., w n ) σ1 2 σ σ 1n σ 21 σ σ 2n σ n1 σ n2... σ 2 w 1 w 2... w n Session 8: The Markowitz problem p. 8
9 Values of w i s There is a restriction in the values of the weights: i=n i=1 w i = 1 Short sale, w i < 0: When you sell an asset that you do not own, the weight becomes negative. (So there can be a combination of some weights such that their sum is greater than one if short sales is allowed.) In India, short sales on assets are prohibited. Today, we trade futures on individual stocks as well as the index. We can implement short sales by selling futures. Session 8: The Markowitz problem p. 9
10 Example: Portfolio mean and variance calculation r 1 N(0.12%, 0.20%). r 2 N(0.15%, 0.18%). σ 1,2 = r = (0.0012, ) ( 0.20% 0.01% Σ = 0.01% 0.18% ) Portfolio p, w p = (0.25, 0.75) What is r p, σ 2 p? Session 8: The Markowitz problem p. 10
11 Solution to the portfolio mean and variance r p = w pµ p = σ 2 p = w p Σ w p = ( ) + ( ) + 2 ( ) = σ p = Note: The variance on the portfolio is much lower than the variance on either asset diversification. Session 8: The Markowitz problem p. 11
12 Issues in diversification Diversification is the reduction in variance of the portfolio returns by : 1. Holding a large number of assets, such that the weights on each become smaller and smaller. The effect of asset i in the portfolio variance is wi 2. The smaller is wi 2, the more the impact on the reduction in variance. 2. Holding uncorrelated assets The lower the correlation, the higher the diversification impact. Session 8: The Markowitz problem p. 12
13 Markowitz s question If the underlying n assets are MVN, then every portfolio maps to some portfolio return RV which is normal. If a portfolio is a linear combination w of the assets, there will be a very large number of them. How do we find good portfolios? Markowitz posed this question: For every level of E(w µ), how can we find the lowest possible w Σw? The dawn of modern finance which ended in a Nobel prize. Session 8: The Markowitz problem p. 13
14 Optimisation problem for a two-asset universe Problem: Given two assets, A and B, and their known characteristics, how should an investment amount V 0 be portioned such that the investment is optimal? Session 8: The Markowitz problem p. 14
15 Solution to the two-asset problem Take random values of w a and calculate the return and variance corresponding to a given w a to get the following graph: Each point is a w a, w b pair: given an E(r p ), we pick that w b such that the variance is minimised. Session 8: The Markowitz problem p. 15
16 Portfolio diagram for an n asset universe Problem: Given n assets and their known characteristics, how should an investment amount X 0 be portioned such that the investment is optimal? Session 8: The Markowitz problem p. 16
17 Solution to the n-asset portfolio problem Solution: Find weights w 1,... w n and calculate E(r p ), σp 2 for each w. The mean variance graph will look like: Session 8: The Markowitz problem p. 17
18 The optimal portfolio in an n asset universe With at least three assets, the feasible region is a 2-D area. The area is convex to the left ie, the rise in r is slower than the increase in σ. The left boundary of the feasible set is called the portfolio frontier or the minimum variance set. The portfolio with the lowest value of σ on the portfolio frontier is called the minimum variance point (MVP). Session 8: The Markowitz problem p. 18
19 The portfolio frontier With all risky assets, we get a portfolio frontier which gives a set of portfolios with the smallest variance for a given expected return. Next problem: how do I know which suits me best? Solution: Utility theory Session 8: The Markowitz problem p. 19
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